beveled style

A term used to describe the distinctive relief decoration commonly used on stucco, wood, stone, glass, and other materials in the Early Islamic period. The beveled style is characterized by symmetrical, abstract, vegetal forms with contours that are carved on a slant.

Marble decorative panel in the beveled style.  From Samarra, Iraq.  Abbasid. 9th c. Museum of Turkish and Islamic Arts, Istanbul.